Lieutenant-Colonel Sir Dealtry Charles Part (28 February 1882 – 9 February 1961) was sheriff and Lord Lieutenant of Bedfordshire and an owner of race horses. He was the son of Charles Part and Isabella Mackintosh (of Mackintosh). He was educated at Harrow School and was commissioned into the militia battalion of the Queen's Own Cameron Highlanders in 1899. He was promoted Lieutenant in 1901. He was commissioned into the regular 21st Lancers in 1902 and was promoted Lieutenant in 1907 and Captain in 1911. He retired before the First World War, but was employed in the Remount Service from 1915 and ended the war as a lieutenant-colonel. He was High Sheriff of Bedfordshire in 1926 and Lord Lieutenant of the County from 1943 to 1957. He lived at Houghton Hall, Houghton Regis Bedfordshire, and w